CN111600476A - System and method for adjusting PFC circuit control signal - Google Patents
System and method for adjusting PFC circuit control signal Download PDFInfo
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- CN111600476A CN111600476A CN202010513858.3A CN202010513858A CN111600476A CN 111600476 A CN111600476 A CN 111600476A CN 202010513858 A CN202010513858 A CN 202010513858A CN 111600476 A CN111600476 A CN 111600476A
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
- H02M1/0022—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being input voltage fluctuations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a system and a method for adjusting a PFC circuit control signal, wherein the system comprises a feedforward module, a feedforward coefficient adjusting module, a current-voltage control loop and a PFC control signal generating module, wherein the feedforward module is used for obtaining a feedforward duty ratio according to mains supply input voltage; the feed-forward coefficient adjusting module is used for generating a feed-forward adjusting coefficient F for adjusting the feed-forward duty ratio according to the mains supply input voltage and adjusting the feed-forward duty ratio by adopting the feed-forward adjusting coefficient F; the current-voltage control loop is used for generating a loop duty ratio according to the output voltage and the output current of the PFC circuit; the PFC control signal generation module is used for obtaining the control signal duty ratio of the PFC circuit according to the feedforward duty ratio adjusted by the feedforward coefficient adjustment module and the loop duty ratio output by the current-voltage control loop. By adopting the technical scheme of the invention, overcurrent faults caused by PFC current can be prevented.
Description
Technical Field
The invention relates to the field of PFC circuits, in particular to a system and a method for adjusting a control signal of a PFC circuit.
Background
The PFC circuit mainly aims at improving THD and PF indexes of power supply products and electrical appliances, and the most important performance is the good or bad adaptability of a power grid. Various problems can occur to the power grid, wherein the most important problem is that the power grid is changed suddenly, the electric appliance cannot work normally if the power grid is changed suddenly, and electric appliance equipment and even the power grid can be damaged if the power grid is changed suddenly. In the face of sudden change of the power grid, whether the PFC circuit can timely complete the dynamic adjustment process to adapt to the change of the power grid is the most important to ensure normal work.
Fig. 1 is a typical PFC control block diagram, which is composed of a feedforward module and a voltage-current control loop (feedforward plus double loop), and the output of the feedforward module and the output of the voltage-current control loop are superimposed to generate a duty ratio of a pulse signal for controlling the PFC circuit.
In the control system of the PFC circuit shown in fig. 1, in order to realize that the current follows the voltage, the current command includes frequency and phase information of the voltage, and a phase-locked module is used. The phase-locked module has a certain time delay, generally one to several mains cycles, when tracking the mains change. And the sudden change of the power grid is in a moment. The expression of the output duty ratio of the feedforward module is
(Vout-Vin)/Vout. Where Vout is the PFC circuit output voltage and Vin is the mains input voltage. When the mains supply suddenly changes, the duty ratio d changes instantly. Once the input mains supply suddenly changes, the feedforward module can directly advance the loop action according to the mains supply, and the output of the voltage and current control loop lags, so that the duty ratio of the whole output is greater than 1 (namely, a PFC switch tube in a PFC circuit is normally on), and overcurrent protection is possibly caused by the fact that the duty ratio is too large.
Disclosure of Invention
The invention aims to provide a system and a method for adjusting a control signal of a PFC circuit, aiming at the technical problem that the existing PFC circuit has poor adaptability to the sudden change of a power grid.
In an embodiment of the present invention, a system for adjusting a control signal of a PFC circuit is provided, which includes a feedforward module, a feedforward coefficient adjustment module, a current-voltage control loop, and a PFC control signal generation module,
the feed-forward module is used for obtaining a feed-forward duty ratio Dforward according to the mains supply input voltage;
the feed-forward coefficient adjusting module is used for generating a feed-forward adjusting coefficient F for adjusting the feed-forward duty ratio Dforward according to the mains supply input voltage and adjusting the feed-forward duty ratio Dforward by adopting the feed-forward adjusting coefficient F;
the current-voltage control loop is used for generating a loop duty ratio Dloop according to the output voltage Ved and the output current Ifed of the PFC circuit;
the PFC control signal generation module is used for obtaining a control signal duty ratio Dpfc of the PFC circuit according to the feedforward duty ratio adjusted by the feedforward coefficient adjustment module and a loop duty ratio Dloop output by the current-voltage control loop, and the calculation formula is as follows:
Dpfc=Dloop+Dforward*F。
in the embodiment of the present invention, the formula for calculating the feedforward duty ratio Dforward by the feedforward module is as follows:
Dforward= (Vout-Vin)/ Vout，
wherein, Vout is the output voltage of the PFC circuit, and Vin is the mains input voltage.
In the embodiment of the invention, the current-voltage control loop comprises a phase-locked module, a voltage PI regulator and a current PI regulator,
the phase locking module is used for outputting phase information of commercial power;
the voltage PI regulator is used for carrying out PI regulation on a difference value between the output voltage Ved of the PFC circuit and a set instruction voltage Vref, and a current signal output by the voltage PI regulator obtains an instruction current Iref according to phase information output by the phase-locked module;
the current PI regulator is used for carrying out PI regulation on the difference value of the output current Ifed of the PFC circuit and the instruction current Iref to obtain a loop duty ratio Dloop output by the current-voltage control loop.
In the embodiment of the present invention, the process of generating the feedforward adjustment coefficient F by the feedforward coefficient adjustment module according to the mains supply input voltage includes:
detecting an input mains voltage;
when the mains voltage Vin is the maximum working voltage Vmax of the PFC circuit, the feedforward coefficient F = Fmax, wherein Fmax is a preset coefficient corresponding to the maximum voltage;
when the mains voltage Vin is the minimum working voltage Vmin of the PFC circuit, the feedforward coefficient F = Fmin, where Fmin is a coefficient corresponding to the preset minimum voltage;
when the mains voltage Vin is between Vmin and Vmax, the feedforward coefficient F is calculated as follows:
F=Vin* (Fmax-Fmin)/( Vmax-Vmin)。
in an embodiment of the present invention, a method for adjusting a control signal of a PFC circuit is further provided, where the method includes:
obtaining a feedforward duty ratio Dforward according to the mains supply input voltage;
generating a feedforward regulation coefficient F for regulating the feedforward duty ratio Dforward according to the mains supply input voltage, and regulating the feedforward duty ratio Dforward by adopting the feedforward regulation coefficient F;
performing loop regulation according to the output voltage Ved and the output current Ifed of the PFC circuit to generate a loop duty ratio Dloop;
and obtaining the control signal duty ratio Dpfc of the PFC circuit according to the feedforward duty ratio adjusted by the feedforward coefficient adjusting module and the loop duty ratio Dloop output by the current-voltage control loop, wherein the calculation formula is as follows:
Dpfc=Dloop+Dforward*F。
in the embodiment of the invention, a formula for obtaining the feedforward duty ratio Dforward according to the mains supply input voltage is as follows:
Dforward= (Vout-Vin)/ Vout，
wherein, Vout is the output voltage of the PFC circuit, and Vin is the mains input voltage.
In the embodiment of the present invention, the loop regulation is performed according to the output voltage Vfed and the output current Ifed of the PFC circuit, and the process of generating the loop duty ratio Dloop includes: ,
performing PI regulation on the difference value of the output voltage Ved of the PFC circuit and the set instruction voltage Vref by adopting a voltage PI regulator;
obtaining an instruction current Iref according to the current signal output by the voltage PI regulator and the phase information of the commercial power;
and a current PI regulator is adopted for carrying out PI regulation on the difference value of the output current Ifed of the PFC circuit and the instruction current Iref to obtain a loop duty ratio Dloop output by the current-voltage control loop.
In the embodiment of the present invention, the process of generating the feedforward adjustment coefficient F according to the mains input voltage includes:
detecting an input mains voltage;
when the mains voltage Vin is the maximum working voltage Vmax of the PFC circuit, the feedforward coefficient F = Fmax, wherein Fmax is a preset coefficient corresponding to the maximum voltage;
when the mains voltage Vin is the minimum working voltage Vmin of the PFC circuit, the feedforward coefficient F = Fmin, where Fmin is a coefficient corresponding to the preset minimum voltage;
when the mains voltage Vin is between Vmin and Vmax, the feedforward coefficient F is calculated as follows:
F=Vin* (Fmax-Fmin)/( Vmax-Vmin)。
compared with the prior art, in the system and the method for adjusting the control signal of the PFC circuit, the feedforward coefficient is dynamically adjusted, the feedforward duty ratio is controlled in a proper range, the PFC circuit cannot generate the overcurrent condition, the maximum value of the feedforward output duty ratio is timely limited when the mains supply suddenly changes, and the feedforward duty ratio is dynamically adjusted according to the mains supply input voltage and the output of the double loop, so that the response action change of the PFC circuit is accelerated, and meanwhile, overcurrent protection can be avoided.
Drawings
Fig. 1 is a schematic diagram of a prior art PFC circuit control signal conditioning system;
fig. 2 is a schematic structural diagram of a system for regulating a control signal of a PFC circuit according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for adjusting the feedforward coefficient of the PFC circuit according to an embodiment of the present invention in fig. 2.
Detailed Description
As shown in fig. 2, the system for adjusting the control signal of the PFC circuit according to the embodiment of the present invention includes a feedforward module, a feedforward coefficient adjusting module, a current-voltage control loop, and a PFC control signal generating module. The feed-forward module is used for obtaining a feed-forward duty ratio Dforward according to the change of the mains supply. The feed-forward coefficient adjusting module is used for generating a feed-forward adjusting coefficient F for adjusting the feed-forward duty ratio Dforward according to the voltage of the mains supply, and adjusting the feed-forward duty ratio Dforward by adopting the feed-forward adjusting coefficient F. The current-voltage control loop is used for generating a loop duty ratio Dloop according to the output voltage Ved and the output current Ifed of the PFC circuit. The PFC control signal generation module is used for obtaining a control signal duty ratio Dpfc of the PFC circuit according to the feedforward duty ratio adjusted by the feedforward coefficient adjustment module and a loop duty ratio Dloop output by the current-voltage control loop, and the specific calculation formula is as follows:
Dpfc=Dloop+Dforward*F。
the feedforward module is used for obtaining a feedforward duty ratio signal Dforward according to the change of commercial power, and the calculation formula of the feedforward duty ratio Dforward is as follows:
Dforward= (Vout-Vin)/ Vout，
wherein, Vout is the output voltage of the PFC circuit, and Vin is the mains input voltage.
The current-voltage control loop is used for performing double-loop regulation according to the output voltage Vaed of the PFC circuit, the output current Ifed, the set instruction voltage Vref and the phase information of the mains supply, and outputting a loop duty ratio Dloop. The current-voltage control loop comprises a phase-locked module, a voltage PI regulator and a current PI regulator. The voltage PI regulator is used for carrying out PI regulation on the output voltage Ved of the PFC circuit and the set instruction voltage Vref, and the current signal output by the voltage PI regulator obtains the instruction current Iref according to the phase information output by the phase locking module. The current PI regulator is used for carrying out PI regulation on the output current Ifed of the PFC circuit and the instruction current Iref to obtain a loop duty ratio Dloop output by the current-voltage control loop.
The feed-forward coefficient adjusting module is used for obtaining an adjusting coefficient F of a feed-forward duty ratio dForward according to the voltage of input mains supply, dynamically adjusting the feed-forward duty ratio Dforward, and dynamically adjusting the feed-forward duty ratio Dforward when the mains supply changes so that the duty ratio Dpfc of a control signal of the PFC circuit is in a proper range, and therefore the output of the PFC circuit cannot be over-current.
It should be noted that, without introducing the feedforward coefficient adjustment module, the control signal duty ratio Dpfc of the PFC circuit = Dloop + Dforward. The feed forward duty cycle Dforward changes immediately when the input mains voltage changes. The process of the loop duty ratio Dloop output by the current-voltage control loop when responding to the change of the input commercial power is as follows: firstly, as the commercial power becomes larger (or smaller), the output voltage of the PFC circuit becomes larger (or smaller); secondly, as the PFC output voltage becomes larger (or smaller) and the feedback voltage VFed sampled back to the loop becomes larger (or smaller), a negative error (or a positive error) occurs in the voltage control loop; in the third step, the control loop is used for eliminating the error, so that the duty ratio Dloop of the output loop can be adjusted according to the error. It can be seen that the regulation of the loop takes time and lags behind the variation of the input mains voltage. When the mains supply changes, the duty ratio of the control signal of the PFC circuit can be over-current due to timely response of feedforward and loop regulation delay, so that the working duty ratio of the PFC circuit is over-large.
FIG. 3 is a schematic diagram of an algorithm for dynamically adjusting the feedforward coefficient by the feedforward coefficient adjusting module. The specific process is as follows:
detecting an input mains voltage;
when the mains voltage Vin is the maximum working voltage Vmax of the PFC circuit, the feedforward coefficient F = Fmax, wherein Fmax is a preset coefficient corresponding to the maximum voltage;
when the mains voltage Vin is the minimum working voltage Vmin of the PFC circuit, the feedforward coefficient F = Fmin, where Fmin is a coefficient corresponding to the preset minimum voltage;
when the mains voltage Vin is between Vmin and Vmax, the feedforward coefficient F is calculated as follows:
F=Vin* (Fmax-Fmin)/( Vmax-Vmin)。
it should be noted that, the PFC circuit usually has a voltage operating range (Vmin, Vmax) for adjusting the sudden change of the mains voltage. Therefore, in the embodiment of the invention, the feedforward coefficients Fmax and Fmin at the maximum working voltage and the minimum working voltage of the PFC circuit are preset, so that the calculated feedforward duty ratio is in a proper range, and the output of the PFC circuit cannot be over-current. Since the mains supply does not have overcurrent at the limit voltage of the PFC circuit, the feedforward coefficient is calculated according to the formula in the working voltage interval of the PFC circuit, so that the overcurrent problem does not exist in the working voltage interval of the PFC circuit.
In summary, in the system and method for adjusting the control signal of the PFC circuit of the present invention, the feedforward coefficient is dynamically adjusted, the feedforward duty ratio is controlled within a suitable range, the PFC circuit does not generate an overcurrent condition, the maximum value of the feedforward output duty ratio is timely limited when the mains supply suddenly changes, and the feedforward duty ratio is dynamically adjusted according to the mains supply input voltage and the output of the dual loop, so that the response action change of the PFC circuit is accelerated, and at the same time, overcurrent protection can be avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A system for adjusting a control signal of a PFC circuit is characterized by comprising a feedforward module, a feedforward coefficient adjusting module, a current-voltage control loop and a PFC control signal generating module,
the feed-forward module is used for obtaining a feed-forward duty ratio Dforward according to the mains supply input voltage;
the feed-forward coefficient adjusting module is used for generating a feed-forward adjusting coefficient F for adjusting the feed-forward duty ratio Dforward according to the mains supply input voltage and adjusting the feed-forward duty ratio Dforward by adopting the feed-forward adjusting coefficient F;
the current-voltage control loop is used for generating a loop duty ratio Dloop according to the output voltage Ved and the output current Ifed of the PFC circuit;
the PFC control signal generation module is used for obtaining a control signal duty ratio Dpfc of the PFC circuit according to the feedforward duty ratio adjusted by the feedforward coefficient adjustment module and a loop duty ratio Dloop output by the current-voltage control loop, and the calculation formula is as follows:
Dpfc=Dloop+Dforward*F。
2. the system for regulating the control signal of the PFC circuit of claim 1, wherein the feed forward module calculates the feed forward duty cycle Dforward according to the following equation:
wherein, Vout is the output voltage of the PFC circuit, and Vin is the mains input voltage.
3. The system for regulating the control signal of the PFC circuit of claim 1, wherein the current-to-voltage control loop comprises a phase-locked module, a voltage PI regulator, and a current PI regulator,
the phase locking module is used for outputting phase information of commercial power;
the voltage PI regulator is used for carrying out PI regulation on a difference value between the output voltage Ved of the PFC circuit and a set instruction voltage Vref, and a current signal output by the voltage PI regulator obtains an instruction current Iref according to phase information output by the phase-locked module;
the current PI regulator is used for carrying out PI regulation on the difference value of the output current Ifed of the PFC circuit and the instruction current Iref to obtain a loop duty ratio Dloop output by the current-voltage control loop.
4. The system for adjusting the control signal of the PFC circuit of claim 1, wherein the generating of the feedforward adjustment coefficient F from the mains input voltage by the feedforward coefficient adjustment module comprises:
detecting an input mains voltage;
when the mains voltage Vin is the maximum working voltage Vmax of the PFC circuit, the feedforward coefficient F = Fmax, wherein Fmax is a preset coefficient corresponding to the maximum voltage;
when the mains voltage Vin is the minimum working voltage Vmin of the PFC circuit, the feedforward coefficient F = Fmin, where Fmin is a coefficient corresponding to the preset minimum voltage;
when the mains voltage Vin is between Vmin and Vmax, the feedforward coefficient F is calculated as follows:
F=Vin* (Fmax-Fmin)/( Vmax-Vmin)。
5. a method for adjusting a control signal of a PFC circuit is characterized by comprising the following steps:
obtaining a feedforward duty ratio Dforward according to the mains supply input voltage;
generating a feedforward regulation coefficient F for regulating the feedforward duty ratio Dforward according to the mains supply input voltage, and regulating the feedforward duty ratio Dforward by adopting the feedforward regulation coefficient F;
performing loop regulation according to the output voltage Ved and the output current Ifed of the PFC circuit to generate a loop duty ratio Dloop;
and obtaining the control signal duty ratio Dpfc of the PFC circuit according to the feedforward duty ratio adjusted by the feedforward coefficient adjusting module and the loop duty ratio Dloop output by the current-voltage control loop, wherein the calculation formula is as follows:
Dpfc=Dloop+Dforward*F。
6. the method of claim 5, wherein the feed-forward duty cycle Dforward is derived from the mains input voltage according to the following formula:
wherein, Vout is the output voltage of the PFC circuit, and Vin is the mains input voltage.
7. The method according to claim 5, wherein the loop regulation is performed according to an output voltage Vfed and an output current Ifed of the PFC circuit, and the step of generating the loop duty ratio Dloop comprises: ,
performing PI regulation on the difference value of the output voltage Ved of the PFC circuit and the set instruction voltage Vref by adopting a voltage PI regulator;
obtaining an instruction current Iref according to the current signal output by the voltage PI regulator and the phase information of the commercial power;
and a current PI regulator is adopted for carrying out PI regulation on the difference value of the output current Ifed of the PFC circuit and the instruction current Iref to obtain a loop duty ratio Dloop output by the current-voltage control loop.
8. The method of claim 5, wherein generating the feed-forward regulation factor F according to the mains input voltage comprises:
detecting an input mains voltage;
when the mains voltage Vin is the maximum working voltage Vmax of the PFC circuit, the feedforward coefficient F = Fmax, wherein Fmax is a preset coefficient corresponding to the maximum voltage;
when the mains voltage Vin is the minimum working voltage Vmin of the PFC circuit, the feedforward coefficient F = Fmin, where Fmin is a coefficient corresponding to the preset minimum voltage;
when the mains voltage Vin is between Vmin and Vmax, the feedforward coefficient F is calculated as follows:
F=Vin* (Fmax-Fmin)/( Vmax-Vmin)。
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Cited By (1)
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| CN112803748A (en) * | 2021-01-29 | 2021-05-14 | 上海瞻芯电子科技有限公司 | Fixed feedforward control method for power factor correction circuit |
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